Muffler.



W. H. OOFFILL.

MUFFLER.

APPLIUAI ION FILED DEC. 22, 1913.

Patented Oct. 18. 1914 a za -flay. 2/92 AiZOfiney.

WALTER H. COFFILL, OF OAKLAND BEACH, RHODE ISLAIID.

MUFFLER.

Specification of Letters Patent.

Patented Oct. 13, 1914:.

Application filed December 22, 1913. Serial No. 808,075.

1 To all whom it may concern Be it known that I, IVALTER H. COFFILL, a citizen of the United States, residing at Oakland Beach, in the county of Kent and State of Rhode Island, have invented certain new and useful Improvements in Mufflers, of which the following is a specification.

My invention relates to mufilers intended for controlling the exhaust of engines and motors and especially adapted for boats.

The essential objects of my invention are to relieve the muffler chamber. of the accumulation and compression'of the burnt gases and substances which choke the mufller chamber and create a back pressure upon the motor or engine, and which the-regular gas outlet is inadequate to relieve; further, to provide a means for cooling the muflller that will avoid-the accumulation of water in the muffier chamber and its overflow therefrom to the motor through the gas inlet as is now occasioned in mufllers having water inlets and'outlets opening into the mufiler chamber, especially in motor boats; and further to enable the-muflie'r to be located at a point below the waterline. I

A further object is to eflicientlycool the .muffier without precipitating the substances held in the gases withinthe muiiler chamber to the water outlet in the bottom thereof,

} and thus choking the water outlet and fouling the muffler walls.

Another object is to minimize the num ber of fittings and enable the same mufiler to exhaust 'from either side of the boat by merely reversing the mufiier.

To the above ends primarily my invention consists in such'parts and combinations of parts as fall withinthe scope ,of the ap pended claims.

In the accompanying drawings which form a part of this specification, Figure 1 is a side elevation. of my muffler, Fig. 2, a section of the sametaken on line to m of Fig. 3, and Fig. 3, a section taken on line 3 y of Fig. 2. a

Like, reference characters indicate like parts throughout the views.

My mufiler comprises 2. preferably spherircal casing indicated in a general way by 1,

provided near its circumference with the usual gas inlet 2 extending from the casing tangentially thereto to form the exhaust inlet pipe 3, connected 'with the exhaust pipe 4 of an internal combustion engine or motor. An outlet 6 is also provided in the casing and having a portion 15 projecting cxteri orly of the casing, and to which is connected, in the present instance, by a collar 18 or otherwise a pipe 20 leading to the atmosphere. In a threaded opening 22 in the easing is an externally threaded plug 24 in alinement with the pipe 11 and movable by means of its threaded connection into contact with and away from said pipe. Integral With. the end of the plug exterior of the casing is a head 26 to accommodate a wrench,

and loose upon the member 24 is a lock nut 27 adapted to cooperate with the exterior surface of the casing. As usual in this type of mufiler the burnt gases enter the inlet 2,

and rotating in the direction of the arrows shown in Figs. 2 and 3 escape through the pipe 11. The plug 24 controls the volume of gas which is permitted to pass through the last mentioned pipe.

The described operation of' the mufller results in compression of the gases and foul accumulations in the chamber 14 which must be removed at intervals to secure satisfa ctory operation. At such times the valve 9 is opened, and the gas passes directly throu h the pipes 3' and 7 drawing with it the ol gases and matter accumulated in the muffler chamber.

In order to reduce the temperature of the muffler due to the high temperature of the gases passing therethrough, and to effect this end without direct contact of the cooling liquid with the gases; which would precipitate the matters in the gases and thus foul the interior of the mufiler, the

casing 1 is composedof an inner shell 28.

and an outer shell 30, spaced from each other to form an intermediatespherical chamber 31, and connected by circular webs 32, 33, 34, and 35, surrounding the members 3, 7, 11 and 24 respectively. At diametrically opposite pointsin its top and bottom the shell'30 has openings 37 and 38, in which are fixed respectively the water inlet. and water outlet pipes and' 4.0.

The water is forced by a pump or otherwise from any source of water supply into the chamber 31 where it circulates between the surfaces of the shells, and escapes through the pipe 4.0, Thus the temperature of the entire casing is lowered What I claim is,

1, In a mufilerof the type set forth, the combination of a substantially spherical casing provided with an exhaust gas inlet and a discharge gas outlet both tangentially disposed with relation to the casing and in alinement withe'aoh other, and with a gas outlet located at right angles to the discharge outlet, and means for closing the discharge gas outlet.

2. In a muiiler of the type set forth, the combination of a substantially spherical casing provided with an exhaust gas inlet and a discharge gas outlet both tangentially disposed with relation to the casing and in alinement with each other, andwith a gas outlet located arially of the casing at right angles to the discharge outlet, a valve in the discharge outlet, an outlet pipe located in the gas outlet and extending into the casing, and a plug adjustably mounted in the casing in alinement with the outlet and extending into the casing.

3.,In=a mufflerof the type set forth, the combination of a casing comprising a spherical. inner shell and a spherical outer shell spaced from the inner shelland provided with tangentially disposed adjacent openings, a web surrounding the openings and connecting. the shells, also provided with tangentially disposed adjacent openings in alinement with the first mentioned openings, a web surrounding the last mentioned openings and connecting the shells, also provided with adjacent openings axially of the shells, a web surrounding the last mentioned openings and connecting the shells, and pipes located in the openings within the webs.

In testimony whereof I have affixed my signature in presence of two witnesses.

lVALTER H. GOFFILL.

\Vitnsses Enw. H. ZIEGLER, Hoim'uo E. BELLOWS. 

